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Math 120
Spring 2008
Brodnick
Lab #7: 7.3, 7.4, & 7.5
1.
Suppose
29
.
0
)
(
and
,
64
.
0
)
(
,
49
.
0
)
(
=
∩
′
=
=
B
A
P
B
P
A
P
.
Find
)
(
B
A
P
∪
′
.
#1 Answer:
2.
The following shows the 8 possible blood types and the percentage of the U.S. population with that type:
What is the probability that a randomly selected person has a
blood type that is type A or Rhpositive?
#2 Answer:
3.
(Refer to #2)
What is the probability that a randomly selected person has a blood type that contains the B
antigen?
(Hint: AB blood contain both the A antigen and the B antigen.)
#3 Answer:
4.
The following table shows the top ten stocks of the “Dogs of the Dow” list on March 1, 2007.
If three of these stocks are randomly selected, what is the probability
that exactly two will have prices below $50?
Express your answer as a
reduced fraction.
#4 Answer:
O positive
38%
O negative
7%
A positive
34%
A negative
6%
B positive
9%
B negative
2%
AB positive
3%
AB negative
1%
Company
Price
Yield
Pfizer
25.04
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 Spring '08
 Brodnick
 Math

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